<?php

class SignatureHelper
{
    public function request($accessKeyId, $accessKeySecret, $domain, $params, $security = false)
    {
        $apiParams = array_merge(array("SignatureMethod" => "HMAC-SHA1", "SignatureNonce" => uniqid(mt_rand(0, 0xffff), true), "SignatureVersion" => "1.0", "AccessKeyId" => $accessKeyId, "Timestamp" => gmdate("Y-m-d\\TH:i:s\\Z"), "Format" => "JSON"), $params);
        ksort($apiParams);
        $sortedQueryStringTmp = '';
        foreach ($apiParams as $key => $value) {
            $sortedQueryStringTmp .= "&" . $this->encode($key) . "=" . $this->encode($value);
        }
        $stringToSign = "GET&%2F&" . $this->encode(substr($sortedQueryStringTmp, 1));
        $sign = base64_encode(hash_hmac("sha1", $stringToSign, $accessKeySecret . "&", true));
        $signature = $this->encode($sign);
        $url = ($security ? "https" : "http") . "://{$domain}/?Signature={$signature}{$sortedQueryStringTmp}";
        try {
            $content = $this->fetchContent($url);
            return json_decode($content);
        } catch (\Exception $e) {
            return false;
        }
    }
    private function encode($str)
    {
        $res = urlencode($str);
        $res = preg_replace("/\\+/", "%20", $res);
        $res = preg_replace("/\\*/", "%2A", $res);
        $res = preg_replace("/%7E/", "~", $res);
        return $res;
    }
    private function fetchContent($url)
    {
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_TIMEOUT, 5);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_HTTPHEADER, array("x-sdk-client" => "php/2.0.0"));
        if (substr($url, 0, 5) == "https") {
            curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
            curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
        }
        $rtn = curl_exec($ch);
        if ($rtn === false) {
            trigger_error("[CURL_" . curl_errno($ch) . "]: " . curl_error($ch), E_USER_ERROR);
        }
        curl_close($ch);
        return $rtn;
    }
}